Triceratops

Triceratops remains a separately diagnosed genus in Longrich and Field’s sampled ontogenetic comparison with Torosaurus; the result is one side of an active taxonomic hypothesis and does not determine the genus’s complete range.

Triceratops is displayed at 68–66 Ma only as the sampled latest-Maastrichtian material used in the Triceratops–Torosaurus test, not complete genus endpoints. The interval is a source-bounded sample window, not a global FAD, LAD, divergence date, continuous occupancy claim or direct-ancestor assertion.

In the stratigraphically controlled Hell Creek skull sample, nasal-horn, rostrum and postorbital-horn characters vary among specimens and intermediate character combinations occur in the middle unit; these are sampled cranial observations, not a direct ancestor–descendant series.

This profile's geographic statement is limited to the northeastern Montana Hell Creek Formation skull sample; it does not assert a genus-wide geographic range or distributional preference.

The cited cranial and stratigraphic studies do not directly determine diet, habitat preference, locomotion, body size or ecological guild for Triceratops; those profile fields are explicitly withheld.